51165623 has 4 divisors (see below), whose sum is σ = 51448488. Its totient is φ = 50882760.

The previous prime is 51165619. The next prime is 51165659. The reversal of 51165623 is 32656115.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51165623 - 2² = 51165619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51162623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141161 + ... + 141522.

It is an arithmetic number, because the mean of its divisors is an integer number (12862122).

Almost surely, 2^51165623 is an apocalyptic number.

51165623 is a deficient number, since it is larger than the sum of its proper divisors (282865).

51165623 is a wasteful number, since it uses less digits than its factorization.

51165623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282864.

The product of its digits is 5400, while the sum is 29.

The square root of 51165623 is about 7153.0149587429. The cubic root of 51165623 is about 371.2439818846.

The spelling of 51165623 in words is "fifty-one million, one hundred sixty-five thousand, six hundred twenty-three".